Nov 29, 2013 - treatment, soft liner type (silicone-based or PMMA-based), and ... tween soft liner and denture base resin, resulting in tearing and mate- rial loss ...
Prosthodontics
Candida albicans biofilms and MMA surface treatment influence the adhesion of soft denture liners to PMMA resin Martinna de Mendonça e Bertolini Yuri Wanderley Cavalcanti Dimorvan Bordin Wander José da Silva Altair Antoninha Del Bel Cury
Department of Prosthodontics and Periodontology, Piracicaba Dental School, Universidade Estadual de Campinas Unicamp, Piracicaba, SP, Brazil.
Abstract: The effect of Candida albicans biofilms and methyl methacrylate (MMA) pretreatment on the bond strength between soft denture liners and polymethyl methacrylate (PMMA) resin was analyzed. Specimens were prepared and randomly divided with respect to PMMA pretreatment, soft liner type (silicone-based or PMMA-based), and presence or absence of a C. albicans biofilm. Samples were composed of a soft denture liner bonded between two PMMA bars. Specimens (n = 10) were incubated to produce a C. albicans biofilm or stored in sterile PBS for 12 days. The tensile bond strength test was performed and failure type was determined using a stereomicroscope. Surface roughness (SR) and scanning electron microscopy (SEM) analysis were performed on denture liners (n = 8). Highest bond strength was observed in samples containing a silicone-based soft liner and stored in PBS, regardless of pretreatment (p
